JPH10284001A - High pressure discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high pressure discharge lamp capable of sufficiently standing large current flow and having a high pressure resistant characteristic when the discharge lamp is operated. SOLUTION: This lamp has a light emitting space surrounding part 51, a glass light emitting pipe constituted of sealing parts connecting to both the ends, a glass member 50 which is embedded at the inside of this sealing part, an external lead 57 extending to the outside from the sealing part 52, an internal lead 55 extending toward the inside of light emitting space from the sealing part 52, a collecting disk 2 which is arranged to face the end face on the light emitting space surrounding part side of the glass member 50 and is connected with the internal lead 55 and a plurality of metallic foil 5 which are extended along the longitudinal direction of the outer periphery of the glass member 50, are electrically connected with the collecting disk 2 at the one end side and are electrically connected with the external lead 57 at the other end side. The plurality of metallic foil 5 have depths of cut at the tips of the sides to be connected with the collecting disk 2 and the metallic foil 5 are bent from the root parts of these depths of cut and are connected with the collecting disk 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high-pressure discharge lamp. In particular, the present invention relates to a high-pressure discharge lamp that is a discharge lamp for a large current of 100 A or more and has a hermetically sealed structure.

[0002]

2. Description of the Related Art In general, high pressure discharge lamps, for example, mercury lamps, are widely used in fields utilizing ultraviolet rays emitted therefrom, that is, in the fields of photochemistry, semiconductor device manufacturing, and other fields. For example, in a high-current or ultra-high-pressure mercury lamp for a large current, the amount of mercury, which is the main component of the luminous gas, is large, so that the gas pressure inside the luminous bulb at the time of lighting is very high, and the calorific value is large. In particular, it has been required that the hermetic sealing portion has high heat resistance and pressure resistance. It is also necessary that mercury be completely evaporated inside the arc tube during operation of the discharge lamp. That is, it is necessary that there is no low temperature portion where condensation of mercury occurs.

For this reason, a conventional high-pressure or ultra-high-pressure mercury lamp employs a so-called rod seal structure in which a power supply lead is directly welded to glass forming an arc tube of a light bulb and hermetically sealed. Instead, a so-called foil seal structure using a sealing metal foil is employed.

FIG. 6 shows a foil seal structure of a conventional high-pressure discharge lamp. The glass member 1 made of quartz glass has a tapered tip. A disk-shaped current collecting disk 2 having substantially the same diameter is disposed at the tip of the tapered portion, and an internal lead 3 extends toward the light emitting space surrounding portion at substantially the center of the current collecting disk 2. Fixed.

Further, on the outer periphery of the glass member 1, for example, four strip-shaped metal foils 5 which are spaced apart from each other in the circumferential direction and extend in the axial direction of the glass member 1, are arranged. Similarly, it extends along the taper 1 and is connected to the current collecting disk 2 by spot welding or the like. Here, the metal foil 5 has a tapered frustoconical shape at the tapered portion, and the band-shaped metal foil 5 becomes narrower as it approaches the current collecting disk 2, and is separated from each other to form the current collecting disk 2. Welded.
By narrowing the tip of the metal foil 5 in this way, the glass foil 1 is satisfactorily disposed along the taper of the glass member 1 without causing wrinkles. To disclose such technology,
3-50609 and 63-31483. The current collecting disk 2 cannot be made large. This is because the current collecting disk 2 and the metal foil 5 are welded, but since the operating pressure of the lamp acts on this portion, the smaller the current collecting disk 2, the higher the resistance to the internal pressure of the light emitting space surrounding portion. is there.

[0006] Here, the allowable current amount of the discharge lamp is determined by the size of the metal foil 5, but since the thickness of the foil is limited, it is actually determined by the width and the number of foils. Is also good. Therefore, in the case of the foil structure having a narrowed tip as described above, the amount of current is suppressed to the minimum width of the foil, and it becomes meaningless to use a wide glass outer peripheral surface of the glass member 1. Would. In particular, there is a problem that the allowable current amount is limited when the current is increasing as in recent years.

[0007] Even in the above-mentioned foil construction, the metal foil 5 must be bent when welding the tip of the metal foil 5 and the current collecting disk 2, and distortion caused by the generation of wrinkles at the time of bending is required. (Stress) cannot be completely prevented. Since the wrinkles determine the internal pressure of the light emitting space surrounding portion, the internal pressure varies depending on the size and shape of the wrinkles.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a high pressure discharge lamp foil seal structure which can sufficiently withstand a large current and has a high pressure resistance during operation of the discharge lamp. Is to do.

[0009]

According to the present invention, there is provided a glass arc tube comprising a light emitting space surrounding portion and sealing portions connected to both ends thereof, a glass member embedded in the sealing portion, An external lead extending from the portion to the outside, an internal lead extending from the sealing portion into the light-emitting space, and disposed facing the end surface of the glass member on the light-emitting space surrounding portion side, and connected to the internal lead. A current collecting disk and a plurality of glass members extending along the outer periphery of the glass member along the longitudinal direction, one end of which is electrically connected to the current collecting disk, and the other end of which is electrically connected to the external lead. In the high-pressure discharge lamp having a metal foil, the metal foil has a cut at a front end on a side connected to the current collecting disk, and the metal foil is bent by bending the metal foil from a substantially end portion of the cut. To be connected to That.

[0010]

In other words, the metal foil has a cut at the front end on the side connected to the current collecting disk, and the metal foil is bent from the substantially end portion of the cut to be connected to the current collecting disk. Since the outer peripheral surface of the glass member can be bent at the same width as when the glass member is extended, the allowable current amount can be increased. Moreover, wrinkles can be suppressed by appropriately bending using the cuts, and the pressure resistance characteristics in the light emitting space surrounding portion can be improved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 6 indicate the same contents. FIG. 1 and FIG. 2 show the metal foil 5. The metal foil 5 has a notch 12 at the tip 11 thereof. Then, the oblique sides of the cuts 12 are bonded to each other. This state is shown in FIG. Bonding is performed by spot welding. Such a metal foil 5 is press-formed with a mold. Here, specific numerical examples are shown. The width of the metal foil 5 is 10 mm, and the cut 12 has a length of about 7 mm in the length direction of the metal foil 5 and an angle of about 90 mm.
°.

FIG. 3 shows a foil seal structure according to the present invention, which corresponds to FIG. 6 in the case of a conventional structure. That is, the glass member 1 has a substantially cylindrical shape as a whole (a part thereof is omitted in FIG. 3), and is bent at substantially 90 degrees at the end on the anode 4 side. Then, it is welded to the current collecting disk 2 using platinum as a binder. This structure
This can be achieved only because the metal foil 5 has a notch, and enables good bending while preventing wrinkles from occurring.

FIG. 4 is an exploded view showing a joined state of the four metal foils 5 and the current collecting disk 2, and the metal foils 5 are expanded for convenience. As described above, the openings of the cuts 12 of the metal foil 5 approach each other, and the metal foil 5 is bent along the dotted line of the tip portion 11 and is welded to the current collecting disk 2 at the bent portion.

FIG. 5 shows a high pressure discharge lamp employing the foil seal construction of the present invention. The light emitting unit 5 surrounds the light emitting space.
1 (light emitting space surrounding portion) are formed, and sealing portions 5 are provided at both ends thereof.
Two are connected. The light emitting unit 51 (light emitting space surrounding unit)
Then, a glass arc tube is formed from the sealing portion 52. The foil seal construction shown in FIG. 3 is embedded in the sealing portion 52. A light-emitting substance such as mercury is sealed in the light-emitting portion 51, and an anode 53 (4) and a cathode 54 are arranged to face each other. The anode 53 (4) is supported by the internal lead 55 (3), penetrates the internal lead rod holding cylinder 56, and further penetrates the current collecting disk 2 and the metal foil 5 welded to the current collecting disk. Then, it is held in the glass member 50 (1). The other end of the metal foil 5 is electrically connected to the external lead 57.
On the other hand, the cathode 54 itself also functions as a lead, and penetrates the holding cylinder 56, the current collecting disk 2, and the metal foil 5 welded to the current collecting disk 2, similarly to the anode 53 (4). It is held in the glass member 50 (1).

With such a foil seal construction, the generation of wrinkles can be almost completely eliminated, and as a result, the strain caused by the generation of various large, medium and small wrinkles as in the prior art can reduce the pressure resistance. Variations could be eliminated. Specifically, when 50 foil seal constructions according to the present invention were produced and subjected to a pressure resistance test, all exhibited values within 40 ± 1 atm.

In addition, the present invention provides a construction in which a cut is provided without narrowing the metal foil and bonded to the current collecting disk as in the present invention. It is possible to flow the amount.

[0000]

As described above, the present invention provides a glass arc tube comprising a light emitting space surrounding portion and sealing portions connected to both ends thereof, a glass member embedded inside the sealing portion,
An external lead extending from the sealing portion to the outside, an internal lead extending from the sealing portion toward the light emitting space, and an internal lead disposed on an end surface of the glass member on the light emitting space surrounding portion side; The connected current collecting disk and the outer periphery of the glass member extend along the longitudinal direction, one end of which is electrically connected to the current collecting disk, and the other end of which is electrically connected to the external lead. A plurality of metal foils, the metal foil has a cut at a tip (welded portion) on a side connected to the current collecting disk, and the cut has a substantially leading end portion. By bending the metal foil and welding it to the current collecting disk, the allowable current amount can be increased as compared with a structure in which the metal foil is narrowed in welding with the current collecting disk. In addition, by using such a structure, the tip of the metal foil can be appropriately bent by using the notch to suppress the occurrence of wrinkles, and as a result, there is no distortion due to the occurrence of wrinkles, and the light emitting space The pressure resistance characteristics in the surrounding portion can be improved.

[Brief description of the drawings]

FIG. 1 shows a metal foil of the present invention.

FIG. 2 shows a metal foil of the present invention.

FIG. 3 depicts a foil seal construction of the present invention.

FIG. 4 is a developed view in which the foil structure of the present invention is welded to a current collecting disk.

FIG. 5 shows a high-pressure discharge lamp according to the invention.

FIG. 6 depicts a conventional high pressure discharge lamp foil seal construction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass member 2 Current-collecting disk 3, 55 Internal lead 4, 53 Anode 5 Metal foil 11 Tip part 12 Notch 51 Light-emitting part 52 Sealing part 54 Cathode 56 Holding cylinder

Claims (1)

[Claims] 1. A glass arc tube comprising a light emitting space surrounding portion and sealing portions connected to both ends thereof, a glass member embedded in the sealing portion, and an external lead extending from the sealing portion to the outside. An internal lead extending from the sealing portion into the light emitting space; a current collecting disk disposed facing an end surface of the glass member on the light emitting space surrounding portion side, and connected to the internal lead; A plurality of metal foils extending along the outer periphery of the member along the longitudinal direction, one end of which is electrically connected to the current collecting disk, and the other end of which is electrically connected to the external lead. In the lamp, the metal foil has a cut at a tip connected to the current collecting disk, and the metal foil is bent from a root portion of the cut to be connected to the current collecting disk. High pressure discharge lamp.